Wilkins RK12-420 Complete Repair Kit for 420/420XL (1/2"–3/4")

Replace worn internal parts quickly with the genuine Wilkins RK12-420 complete repair kit. Designed for the 1/2"–3/4" Wilkins Model 420 and 420XL pressure vacuum breaker assemblies, this kit provides the internal components needed to restore proper operation and backflow protection without replacing the entire assembly.

• Direct compatibility with Wilkins Model 420 and 420XL (1/2"–3/4").
• Includes key internal parts for a full service: seat assembly, float assembly, bonnet and O-rings; select distributors list part numbers 421-180 (seat), 421-340 (float), 421-20 (bonnet) and 034N O-ring.
• All parts are genuine Zurn/Wilkins replacement components engineered for reliable sealing and long service life.
• Helps avoid the cost and downtime of full valve replacement—ideal for routine maintenance and field service.
• Meets industry standards for backflow prevention; manufacturer documentation and installation instructions are available for reference.

Why technicians choose this kit: the RK12-420 groups the most commonly replaced internal components into a single kit so repairs are faster and stocking is simplified. Use basic hand tools and follow Wilkins installation instructions for a straightforward service procedure. The kit is covered by the manufacturer's limited warranty; check the included documentation for terms and conditions.